If there is a pip inside you will not be able to see anything but black. The problem would be humidity. When you open the bator during the last three days, you might run into the problem of your pips sticking inside the egg and then they will die. If you have opened the bator after your heard...
I have ran many electric fences and have never paid any attention to underground metal pipes. The one I have around my chicken yard is grounded to the meter base ground along with the plumbing for the house. There are metal pipes there and no problems. Just have to make sure that your hot wires...